ECE 3551-Lab7

ECE 3551-Lab7 - ECE 3551 MICROCOMPUTER SYSTEMS 1 Lab...

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ECE 3551 MICROCOMPUTER SYSTEMS 1 Lab 7—Learn to process audio data OBJECTIVE: Learn how to process audio data in ADSP-BF533 EZ-Kit Lite. Learn how to implement digital iir filer in DSP. Learn how to control the audio input/output. Create the Project 1. Before power on the board , make sure that switch SW9 pin1,pin2, pin3, pin4, pin5 and pin6 are turned on., which means all pins in SW9 must be on. 2. Copy the project in Lab #7 to “u:\ece3551\labs\lab7” Modify the Project In this lab, you need to learn how to filter audio data and compare the original audio and the filtered audio. In this Lab exercise only input 1 and output 1 will be used.
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Read the data from the input 1 and save it’s copy: one is the original data and another will be the filtered data. PF8 is used to control which data is sent to output 1: In the beginning, LED4 is off, and the original data is send to output1. So what is heard is the original audio. When PF8 is pressed: The LED4 should turn on, and The filtered data is send to output. What is heard, therefore is filtered audio. By pushing PF8 again, the LED4 should turn off, and the original data is send to output1; what is heard is the original audio again. Designing IIR Filters: Matlab exports IIR filters in a direct-form II sections each being of second order. The general relationship of output and input given in Z transform is of the form: ( 29 ( 29 ( 29 ( 29 = - - - - = + + + + = = = K k k k k k k K k k z a z a z b z b b G z H G z X z Y z H 1 2 2 1 1 2 2 1 1 0 1 1 Note that z -1 denotes unit delay D operator and z -2 , denotes 2 unit delays, i.e, D 2 . Y(z) is z-transform of the output, X(z) is z-transform of the input. The block diagram realization of a filter with K=2 sections is given below: Example of a fourth-order IIR filter realized by cascading of two biquads. ADI VisualDSP++ Blackfin library provides several functions that help implementation of the iir
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ECE 3551-Lab7 - ECE 3551 MICROCOMPUTER SYSTEMS 1 Lab...

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